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en.wikipedia.org/wiki/Cave_of_the_Crystals

Cave of the Crystals or Giant Crystal Cave is a cave connected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, Mexico. The main chamber contains giant selenite crystals (gypsum, CaSO4·2 H2O), some of the largest natural crystals ever found.

ngm.nationalgeographic.com/2008/11/crystal-giants/shea-text

Dozens of purple and white crystals push up from it like shards of glass. ... Nothing compares with the giants found in Cueva de los Cristales, or Cave of Crystals.

www.beautifulworld.com/north-america/mexico/cave-of-the-crystals

The Cave of the Crystals is a natural marvel in Chihuahua, Mexico. ... Alas, the man was found dead the next day; cooked, as though he were food in an oven.

www.crystalinks.com/mexicocrystals.html

Naica is a lead, zinc and silver mine in which large voids have been found, containing crystals of selenite (gypsum) as large as 4 feet in diameter and 50 feet  ...

sciencing.com/crystals-5640076.html

5 days ago ... Abandoned quarries where sand and gravel have been removed provide another location where crystals can sometimes be found, depending ...

www.answers.com/Q/Where_are_crystals_found

In rocks, mines....practically everywhere. Crystals are found all around the world. One place is in caves where they can be quite large. Geodes contain crystals ...

www.arkansas.com/outdoors/unique/crystals

The ancient Ouachita Mountain area of Arkansas was considered a mystical location by Native American tribes. The hot springs in the "Valley of the Vapors," ...

nature.berkeley.edu/classes/eps2/wisc/Lect3.html

A similar, familiar processes is formation of salt crystals by evaporation of sea water. The mineral that forms is determined by what the dissolved elements are.

www.tourismontheedge.com/get-extreme/largest-crystals-in-the-world-giant-crystal-cave-mexico

Jan 4, 2013 ... The spectacular Giant Crystal Cave is connected to the Naica Mine, located in Chihuahua, Mexico. 300 meters bellow the surface.

www.bibliotecapleyades.net/ciencia/ciencia_crystalcave01.htm

Naica is a lead, zinc and silver mine in which large voids have been found, containing crystals of selenite (gypsum) as large as 4 feet in diameter and 50 feet  ...